drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2015-2018 Mellanox Technologies. All rights reserved */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/dcbnl.h>
#include <linux/if_ether.h>
#include <linux/list.h>
#include <linux/netlink.h>

#include "spectrum.h"
#include "core.h"
#include "port.h"
#include "reg.h"

struct mlxsw_sp_sb_pr {
	enum mlxsw_reg_sbpr_mode mode;
	u32 size;
	u8 freeze_mode:1,
	   freeze_size:1;
};

struct mlxsw_cp_sb_occ {
	u32 cur;
	u32 max;
};

struct mlxsw_sp_sb_cm {
	u32 min_buff;
	u32 max_buff;
	u16 pool_index;
	struct mlxsw_cp_sb_occ occ;
	u8 freeze_pool:1,
	   freeze_thresh:1;
};

#define MLXSW_SP_SB_INFI -1U
#define MLXSW_SP_SB_REST -2U

struct mlxsw_sp_sb_pm {
	u32 min_buff;
	u32 max_buff;
	struct mlxsw_cp_sb_occ occ;
};

struct mlxsw_sp_sb_mm {
	u32 min_buff;
	u32 max_buff;
	u16 pool_index;
};

struct mlxsw_sp_sb_pool_des {
	enum mlxsw_reg_sbxx_dir dir;
	u8 pool;
};

#define MLXSW_SP_SB_POOL_ING		0
#define MLXSW_SP_SB_POOL_EGR		4
#define MLXSW_SP_SB_POOL_EGR_MC		8
#define MLXSW_SP_SB_POOL_ING_CPU	9
#define MLXSW_SP_SB_POOL_EGR_CPU	10

static const struct mlxsw_sp_sb_pool_des mlxsw_sp1_sb_pool_dess[] = {
	{MLXSW_REG_SBXX_DIR_INGRESS, 0},
	{MLXSW_REG_SBXX_DIR_INGRESS, 1},
	{MLXSW_REG_SBXX_DIR_INGRESS, 2},
	{MLXSW_REG_SBXX_DIR_INGRESS, 3},
	{MLXSW_REG_SBXX_DIR_EGRESS, 0},
	{MLXSW_REG_SBXX_DIR_EGRESS, 1},
	{MLXSW_REG_SBXX_DIR_EGRESS, 2},
	{MLXSW_REG_SBXX_DIR_EGRESS, 3},
	{MLXSW_REG_SBXX_DIR_EGRESS, 15},
	{MLXSW_REG_SBXX_DIR_INGRESS, 4},
	{MLXSW_REG_SBXX_DIR_EGRESS, 4},
};

static const struct mlxsw_sp_sb_pool_des mlxsw_sp2_sb_pool_dess[] = {
	{MLXSW_REG_SBXX_DIR_INGRESS, 0},
	{MLXSW_REG_SBXX_DIR_INGRESS, 1},
	{MLXSW_REG_SBXX_DIR_INGRESS, 2},
	{MLXSW_REG_SBXX_DIR_INGRESS, 3},
	{MLXSW_REG_SBXX_DIR_EGRESS, 0},
	{MLXSW_REG_SBXX_DIR_EGRESS, 1},
	{MLXSW_REG_SBXX_DIR_EGRESS, 2},
	{MLXSW_REG_SBXX_DIR_EGRESS, 3},
	{MLXSW_REG_SBXX_DIR_EGRESS, 15},
	{MLXSW_REG_SBXX_DIR_INGRESS, 4},
	{MLXSW_REG_SBXX_DIR_EGRESS, 4},
};

#define MLXSW_SP_SB_ING_TC_COUNT 8
#define MLXSW_SP_SB_EG_TC_COUNT 16

struct mlxsw_sp_sb_port {
	struct mlxsw_sp_sb_cm ing_cms[MLXSW_SP_SB_ING_TC_COUNT];
	struct mlxsw_sp_sb_cm eg_cms[MLXSW_SP_SB_EG_TC_COUNT];
	struct mlxsw_sp_sb_pm *pms;
};

struct mlxsw_sp_sb {
	struct mlxsw_sp_sb_pr *prs;
	struct mlxsw_sp_sb_port *ports;
	u32 cell_size;
	u32 max_headroom_cells;
	u64 sb_size;
};

struct mlxsw_sp_sb_vals {
	unsigned int pool_count;
	const struct mlxsw_sp_sb_pool_des *pool_dess;
	const struct mlxsw_sp_sb_pm *pms;
	const struct mlxsw_sp_sb_pm *pms_cpu;
	const struct mlxsw_sp_sb_pr *prs;
	const struct mlxsw_sp_sb_mm *mms;
	const struct mlxsw_sp_sb_cm *cms_ingress;
	const struct mlxsw_sp_sb_cm *cms_egress;
	const struct mlxsw_sp_sb_cm *cms_cpu;
	unsigned int mms_count;
	unsigned int cms_ingress_count;
	unsigned int cms_egress_count;
	unsigned int cms_cpu_count;
};

struct mlxsw_sp_sb_ops {
	u32 (*int_buf_size_get)(int mtu, u32 speed);
};

u32 mlxsw_sp_cells_bytes(const struct mlxsw_sp *mlxsw_sp, u32 cells)
{
	return mlxsw_sp->sb->cell_size * cells;
}

u32 mlxsw_sp_bytes_cells(const struct mlxsw_sp *mlxsw_sp, u32 bytes)
{
	return DIV_ROUND_UP(bytes, mlxsw_sp->sb->cell_size);
}

static u32 mlxsw_sp_port_headroom_8x_adjust(const struct mlxsw_sp_port *mlxsw_sp_port,
					    u32 size_cells)
{
	/* Ports with eight lanes use two headroom buffers between which the
	 * configured headroom size is split. Therefore, multiply the calculated
	 * headroom size by two.
	 */
	return mlxsw_sp_port->mapping.width == 8 ? 2 * size_cells : size_cells;
}

static struct mlxsw_sp_sb_pr *mlxsw_sp_sb_pr_get(struct mlxsw_sp *mlxsw_sp,
						 u16 pool_index)
{
	return &mlxsw_sp->sb->prs[pool_index];
}

static bool mlxsw_sp_sb_cm_exists(u8 pg_buff, enum mlxsw_reg_sbxx_dir dir)
{
	if (dir == MLXSW_REG_SBXX_DIR_INGRESS)
		return pg_buff < MLXSW_SP_SB_ING_TC_COUNT;
	else
		return pg_buff < MLXSW_SP_SB_EG_TC_COUNT;
}

static struct mlxsw_sp_sb_cm *mlxsw_sp_sb_cm_get(struct mlxsw_sp *mlxsw_sp,
						 u16 local_port, u8 pg_buff,
						 enum mlxsw_reg_sbxx_dir dir)
{
	struct mlxsw_sp_sb_port *sb_port = &mlxsw_sp->sb->ports[local_port];

	WARN_ON(!mlxsw_sp_sb_cm_exists(pg_buff, dir));
	if (dir == MLXSW_REG_SBXX_DIR_INGRESS)
		return &sb_port->ing_cms[pg_buff];
	else
		return &sb_port->eg_cms[pg_buff];
}

static struct mlxsw_sp_sb_pm *mlxsw_sp_sb_pm_get(struct mlxsw_sp *mlxsw_sp,
						 u16 local_port, u16 pool_index)
{
	return &mlxsw_sp->sb->ports[local_port].pms[pool_index];
}

static int mlxsw_sp_sb_pr_write(struct mlxsw_sp *mlxsw_sp, u16 pool_index,
				enum mlxsw_reg_sbpr_mode mode,
				u32 size, bool infi_size)
{
	const struct mlxsw_sp_sb_pool_des *des =
		&mlxsw_sp->sb_vals->pool_dess[pool_index];
	char sbpr_pl[MLXSW_REG_SBPR_LEN];
	struct mlxsw_sp_sb_pr *pr;
	int err;

	mlxsw_reg_sbpr_pack(sbpr_pl, des->pool, des->dir, mode,
			    size, infi_size);
	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbpr), sbpr_pl);
	if (err)
		return err;

	if (infi_size)
		size = mlxsw_sp_bytes_cells(mlxsw_sp, mlxsw_sp->sb->sb_size);
	pr = mlxsw_sp_sb_pr_get(mlxsw_sp, pool_index);
	pr->mode = mode;
	pr->size = size;
	return 0;
}

static int mlxsw_sp_sb_pr_desc_write(struct mlxsw_sp *mlxsw_sp,
				     enum mlxsw_reg_sbxx_dir dir,
				     enum mlxsw_reg_sbpr_mode mode,
				     u32 size, bool infi_size)
{
	char sbpr_pl[MLXSW_REG_SBPR_LEN];

	/* The FW default descriptor buffer configuration uses only pool 14 for
	 * descriptors.
	 */
	mlxsw_reg_sbpr_pack(sbpr_pl, 14, dir, mode, size, infi_size);
	mlxsw_reg_sbpr_desc_set(sbpr_pl, true);
	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbpr), sbpr_pl);
}

static int mlxsw_sp_sb_cm_write(struct mlxsw_sp *mlxsw_sp, u16 local_port,
				u8 pg_buff, u32 min_buff, u32 max_buff,
				bool infi_max, u16 pool_index)
{
	const struct mlxsw_sp_sb_pool_des *des =
		&mlxsw_sp->sb_vals->pool_dess[pool_index];
	char sbcm_pl[MLXSW_REG_SBCM_LEN];
	struct mlxsw_sp_sb_cm *cm;
	int err;

	mlxsw_reg_sbcm_pack(sbcm_pl, local_port, pg_buff, des->dir,
			    min_buff, max_buff, infi_max, des->pool);
	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbcm), sbcm_pl);
	if (err)
		return err;

	if (mlxsw_sp_sb_cm_exists(pg_buff, des->dir)) {
		if (infi_max)
			max_buff = mlxsw_sp_bytes_cells(mlxsw_sp,
							mlxsw_sp->sb->sb_size);

		cm = mlxsw_sp_sb_cm_get(mlxsw_sp, local_port, pg_buff,
					des->dir);
		cm->min_buff = min_buff;
		cm->max_buff = max_buff;
		cm->pool_index = pool_index;
	}
	return 0;
}

static int mlxsw_sp_sb_pm_write(struct mlxsw_sp *mlxsw_sp, u16 local_port,
				u16 pool_index, u32 min_buff, u32 max_buff)
{
	const struct mlxsw_sp_sb_pool_des *des =
		&mlxsw_sp->sb_vals->pool_dess[pool_index];
	char sbpm_pl[MLXSW_REG_SBPM_LEN];
	struct mlxsw_sp_sb_pm *pm;
	int err;

	mlxsw_reg_sbpm_pack(sbpm_pl, local_port, des->pool, des->dir, false,
			    min_buff, max_buff);
	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbpm), sbpm_pl);
	if (err)
		return err;

	pm = mlxsw_sp_sb_pm_get(mlxsw_sp, local_port, pool_index);
	pm->min_buff = min_buff;
	pm->max_buff = max_buff;
	return 0;
}

static int mlxsw_sp_sb_pm_occ_clear(struct mlxsw_sp *mlxsw_sp, u16 local_port,
				    u16 pool_index, struct list_head *bulk_list)
{
	const struct mlxsw_sp_sb_pool_des *des =
		&mlxsw_sp->sb_vals->pool_dess[pool_index];
	char sbpm_pl[MLXSW_REG_SBPM_LEN];

	if (local_port == MLXSW_PORT_CPU_PORT &&
	    des->dir == MLXSW_REG_SBXX_DIR_INGRESS)
		return 0;

	mlxsw_reg_sbpm_pack(sbpm_pl, local_port, des->pool, des->dir,
			    true, 0, 0);
	return mlxsw_reg_trans_query(mlxsw_sp->core, MLXSW_REG(sbpm), sbpm_pl,
				     bulk_list, NULL, 0);
}

static void mlxsw_sp_sb_pm_occ_query_cb(struct mlxsw_core *mlxsw_core,
					char *sbpm_pl, size_t sbpm_pl_len,
					unsigned long cb_priv)
{
	struct mlxsw_sp_sb_pm *pm = (struct mlxsw_sp_sb_pm *) cb_priv;

	mlxsw_reg_sbpm_unpack(sbpm_pl, &pm->occ.cur, &pm->occ.max);
}

static int mlxsw_sp_sb_pm_occ_query(struct mlxsw_sp *mlxsw_sp, u16 local_port,
				    u16 pool_index, struct list_head *bulk_list)
{
	const struct mlxsw_sp_sb_pool_des *des =
		&mlxsw_sp->sb_vals->pool_dess[pool_index];
	char sbpm_pl[MLXSW_REG_SBPM_LEN];
	struct mlxsw_sp_sb_pm *pm;

	if (local_port == MLXSW_PORT_CPU_PORT &&
	    des->dir == MLXSW_REG_SBXX_DIR_INGRESS)
		return 0;

	pm = mlxsw_sp_sb_pm_get(mlxsw_sp, local_port, pool_index);
	mlxsw_reg_sbpm_pack(sbpm_pl, local_port, des->pool, des->dir,
			    false, 0, 0);
	return mlxsw_reg_trans_query(mlxsw_sp->core, MLXSW_REG(sbpm), sbpm_pl,
				     bulk_list,
				     mlxsw_sp_sb_pm_occ_query_cb,
				     (unsigned long) pm);
}

void mlxsw_sp_hdroom_prios_reset_buf_idx(struct mlxsw_sp_hdroom *hdroom)
{
	int prio;

	for (prio = 0; prio < IEEE_8021QAZ_MAX_TCS; prio++) {
		switch (hdroom->mode) {
		case MLXSW_SP_HDROOM_MODE_DCB:
			hdroom->prios.prio[prio].buf_idx = hdroom->prios.prio[prio].ets_buf_idx;
			break;
		case MLXSW_SP_HDROOM_MODE_TC:
			hdroom->prios.prio[prio].buf_idx = hdroom->prios.prio[prio].set_buf_idx;
			break;
		}
	}
}

void mlxsw_sp_hdroom_bufs_reset_lossiness(struct mlxsw_sp_hdroom *hdroom)
{
	int prio;
	int i;

	for (i = 0; i < DCBX_MAX_BUFFERS; i++)
		hdroom->bufs.buf[i].lossy = true;

	for (prio = 0; prio < IEEE_8021Q_MAX_PRIORITIES; prio++) {
		if (!hdroom->prios.prio[prio].lossy)
			hdroom->bufs.buf[hdroom->prios.prio[prio].buf_idx].lossy = false;
	}
}

static u16 mlxsw_sp_hdroom_buf_threshold_get(const struct mlxsw_sp *mlxsw_sp, int mtu)
{
	return 2 * mlxsw_sp_bytes_cells(mlxsw_sp, mtu);
}

static void mlxsw_sp_hdroom_buf_pack(char *pbmc_pl, int index, u16 size, u16 thres, bool lossy)
{
	if (lossy)
		mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl, index, size);
	else
		mlxsw_reg_pbmc_lossless_buffer_pack(pbmc_pl, index, size,
						    thres);
}

static u16 mlxsw_sp_hdroom_buf_delay_get(const struct mlxsw_sp *mlxsw_sp,
					 const struct mlxsw_sp_hdroom *hdroom)
{
	u16 delay_cells;

	delay_cells = mlxsw_sp_bytes_cells(mlxsw_sp, hdroom->delay_bytes);

	/* In the worst case scenario the delay will be made up of packets that
	 * are all of size CELL_SIZE + 1, which means each packet will require
	 * almost twice its true size when buffered in the switch. We therefore
	 * multiply this value by the "cell factor", which is close to 2.
	 *
	 * Another MTU is added in case the transmitting host already started
	 * transmitting a maximum length frame when the PFC packet was received.
	 */
	return 2 * delay_cells + mlxsw_sp_bytes_cells(mlxsw_sp, hdroom->mtu);
}

static u32 mlxsw_sp_hdroom_int_buf_size_get(struct mlxsw_sp *mlxsw_sp, int mtu, u32 speed)
{
	u32 buffsize = mlxsw_sp->sb_ops->int_buf_size_get(mtu, speed);

	return mlxsw_sp_bytes_cells(mlxsw_sp, buffsize) + 1;
}

static bool mlxsw_sp_hdroom_buf_is_used(const struct mlxsw_sp_hdroom *hdroom, int buf)
{
	int prio;

	for (prio = 0; prio < IEEE_8021QAZ_MAX_TCS; prio++) {
		if (hdroom->prios.prio[prio].buf_idx == buf)
			return true;
	}
	return false;
}

void mlxsw_sp_hdroom_bufs_reset_sizes(struct mlxsw_sp_port *mlxsw_sp_port,
				      struct mlxsw_sp_hdroom *hdroom)
{
	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
	unsigned int max_mtu = mlxsw_sp_port->dev->max_mtu;
	u16 reserve_cells;
	int i;

	max_mtu += MLXSW_PORT_ETH_FRAME_HDR;
	/* Internal buffer. */
	reserve_cells = mlxsw_sp_hdroom_int_buf_size_get(mlxsw_sp, max_mtu,
							 mlxsw_sp_port->max_speed);
	reserve_cells = mlxsw_sp_port_headroom_8x_adjust(mlxsw_sp_port, reserve_cells);
	hdroom->int_buf.reserve_cells = reserve_cells;

	if (hdroom->int_buf.enable)
		hdroom->int_buf.size_cells = reserve_cells;
	else
		hdroom->int_buf.size_cells = 0;

	/* PG buffers. */
	for (i = 0; i < DCBX_MAX_BUFFERS; i++) {
		struct mlxsw_sp_hdroom_buf *buf = &hdroom->bufs.buf[i];
		u16 thres_cells;
		u16 delay_cells;

		if (!mlxsw_sp_hdroom_buf_is_used(hdroom, i)) {
			thres_cells = 0;
			delay_cells = 0;
		} else if (buf->lossy) {
			thres_cells = mlxsw_sp_hdroom_buf_threshold_get(mlxsw_sp, hdroom->mtu);
			delay_cells = 0;
		} else {
			thres_cells = mlxsw_sp_hdroom_buf_threshold_get(mlxsw_sp, hdroom->mtu);
			delay_cells = mlxsw_sp_hdroom_buf_delay_get(mlxsw_sp, hdroom);
		}

		thres_cells = mlxsw_sp_port_headroom_8x_adjust(mlxsw_sp_port, thres_cells);
		delay_cells = mlxsw_sp_port_headroom_8x_adjust(mlxsw_sp_port, delay_cells);

		buf->thres_cells = thres_cells;
		if (hdroom->mode == MLXSW_SP_HDROOM_MODE_DCB) {
			buf->size_cells = thres_cells + delay_cells;
		} else {
			/* Do not allow going below the minimum size, even if
			 * the user requested it.
			 */
			buf->size_cells = max(buf->set_size_cells, buf->thres_cells);
		}
	}
}

#define MLXSW_SP_PB_UNUSED 8

static int mlxsw_sp_hdroom_configure_buffers(struct mlxsw_sp_port *mlxsw_sp_port,
					     const struct mlxsw_sp_hdroom *hdroom, bool force)
{
	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
	char pbmc_pl[MLXSW_REG_PBMC_LEN];
	bool dirty;
	int err;
	int i;

	dirty = memcmp(&mlxsw_sp_port->hdroom->bufs, &hdroom->bufs, sizeof(hdroom->bufs));
	if (!dirty && !force)
		return 0;

	mlxsw_reg_pbmc_pack(pbmc_pl, mlxsw_sp_port->local_port, 0xffff, 0xffff / 2);
	for (i = 0; i < MLXSW_SP_PB_COUNT; i++) {
		const struct mlxsw_sp_hdroom_buf *buf = &hdroom->bufs.buf[i];

		if (i == MLXSW_SP_PB_UNUSED)
			continue;

		mlxsw_sp_hdroom_buf_pack(pbmc_pl, i, buf->size_cells, buf->thres_cells, buf->lossy);
	}

	mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl, MLXSW_REG_PBMC_PORT_SHARED_BUF_IDX, 0);
	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(pbmc), pbmc_pl);
	if (err)
		return err;

	mlxsw_sp_port->hdroom->bufs = hdroom->bufs;
	return 0;
}

static int mlxsw_sp_hdroom_configure_priomap(struct mlxsw_sp_port *mlxsw_sp_port,
					     const struct mlxsw_sp_hdroom *hdroom, bool force)
{
	char pptb_pl[MLXSW_REG_PPTB_LEN];
	bool dirty;
	int prio;
	int err;

	dirty = memcmp(&mlxsw_sp_port->hdroom->prios, &hdroom->prios, sizeof(hdroom->prios));
	if (!dirty && !force)
		return 0;

	mlxsw_reg_pptb_pack(pptb_pl, mlxsw_sp_port->local_port);
	for (prio = 0; prio < IEEE_8021QAZ_MAX_TCS; prio++)
		mlxsw_reg_pptb_prio_to_buff_pack(pptb_pl, prio, hdroom->prios.prio[prio].buf_idx);

	err = mlxsw_reg_write(mlxsw_sp_port->mlxsw_sp->core, MLXSW_REG(pptb), pptb_pl);
	if (err)
		return err;

	mlxsw_sp_port->hdroom->prios = hdroom->prios;
	return 0;
}

static int mlxsw_sp_hdroom_configure_int_buf(struct mlxsw_sp_port *mlxsw_sp_port,
					     const struct mlxsw_sp_hdroom *hdroom, bool force)
{
	char sbib_pl[MLXSW_REG_SBIB_LEN];
	bool dirty;
	int err;

	dirty = memcmp(&mlxsw_sp_port->hdroom->int_buf, &hdroom->int_buf, sizeof(hdroom->int_buf));
	if (!dirty && !force)
		return 0;

	mlxsw_reg_sbib_pack(sbib_pl, mlxsw_sp_port->local_port, hdroom->int_buf.size_cells);
	err = mlxsw_reg_write(mlxsw_sp_port->mlxsw_sp->core, MLXSW_REG(sbib), sbib_pl);
	if (err)
		return err;

	mlxsw_sp_port->hdroom->int_buf = hdroom->int_buf;
	return 0;
}

static bool mlxsw_sp_hdroom_bufs_fit(struct mlxsw_sp *mlxsw_sp,
				     const struct mlxsw_sp_hdroom *hdroom)
{
	u32 taken_headroom_cells = 0;
	int i;

	for (i = 0; i < MLXSW_SP_PB_COUNT; i++)
		taken_headroom_cells += hdroom->bufs.buf[i].size_cells;

	taken_headroom_cells += hdroom->int_buf.reserve_cells;
	return taken_headroom_cells <= mlxsw_sp->sb->max_headroom_cells;
}

static int __mlxsw_sp_hdroom_configure(struct mlxsw_sp_port *mlxsw_sp_port,
				       const struct mlxsw_sp_hdroom *hdroom, bool force)
{
	struct mlxsw_sp_hdroom orig_hdroom;
	struct mlxsw_sp_hdroom tmp_hdroom;
	int err;
	int i;

	/* Port buffers need to be configured in three steps. First, all buffers
	 * with non-zero size are configured. Then, prio-to-buffer map is
	 * updated, allowing traffic to flow to the now non-zero buffers.
	 * Finally, zero-sized buffers are configured, because now no traffic
	 * should be directed to them anymore. This way, in a non-congested
	 * system, no packet drops are introduced by the reconfiguration.
	 */

	orig_hdroom = *mlxsw_sp_port->hdroom;
	tmp_hdroom = orig_hdroom;
	for (i = 0; i < MLXSW_SP_PB_COUNT; i++) {
		if (hdroom->bufs.buf[i].size_cells)
			tmp_hdroom.bufs.buf[i] = hdroom->bufs.buf[i];
	}

	if (!mlxsw_sp_hdroom_bufs_fit(mlxsw_sp_port->mlxsw_sp, &tmp_hdroom) ||
	    !mlxsw_sp_hdroom_bufs_fit(mlxsw_sp_port->mlxsw_sp, hdroom))
		return -ENOBUFS;

	err = mlxsw_sp_hdroom_configure_buffers(mlxsw_sp_port, &tmp_hdroom, force);
	if (err)
		return err;

	err = mlxsw_sp_hdroom_configure_priomap(mlxsw_sp_port, hdroom, force);
	if (err)
		goto err_configure_priomap;

	err = mlxsw_sp_hdroom_configure_buffers(mlxsw_sp_port, hdroom, false);
	if (err)
		goto err_configure_buffers;

	err = mlxsw_sp_hdroom_configure_int_buf(mlxsw_sp_port, hdroom, false);
	if (err)
		goto err_configure_int_buf;

	*mlxsw_sp_port->hdroom = *hdroom;
	return 0;

err_configure_int_buf:
	mlxsw_sp_hdroom_configure_buffers(mlxsw_sp_port, &tmp_hdroom, false);
err_configure_buffers:
	mlxsw_sp_hdroom_configure_priomap(mlxsw_sp_port, &tmp_hdroom, false);
err_configure_priomap:
	mlxsw_sp_hdroom_configure_buffers(mlxsw_sp_port, &orig_hdroom, false);
	return err;
}

int mlxsw_sp_hdroom_configure(struct mlxsw_sp_port *mlxsw_sp_port,
			      const struct mlxsw_sp_hdroom *hdroom)
{
	return __mlxsw_sp_hdroom_configure(mlxsw_sp_port, hdroom, false);
}

static int mlxsw_sp_port_headroom_init(struct mlxsw_sp_port *mlxsw_sp_port)
{
	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
	struct mlxsw_sp_hdroom hdroom = {};
	u32 size9;
	int prio;

	hdroom.mtu = mlxsw_sp_port->dev->mtu;
	hdroom.mode = MLXSW_SP_HDROOM_MODE_DCB;
	for (prio = 0; prio < IEEE_8021QAZ_MAX_TCS; prio++)
		hdroom.prios.prio[prio].lossy = true;

	mlxsw_sp_hdroom_bufs_reset_lossiness(&hdroom);
	mlxsw_sp_hdroom_bufs_reset_sizes(mlxsw_sp_port, &hdroom);

	/* Buffer 9 is used for control traffic. */
	size9 = mlxsw_sp_port_headroom_8x_adjust(mlxsw_sp_port,
						 mlxsw_sp_port->dev->max_mtu +
						 MLXSW_PORT_ETH_FRAME_HDR);
	hdroom.bufs.buf[9].size_cells = mlxsw_sp_bytes_cells(mlxsw_sp, size9);

	return __mlxsw_sp_hdroom_configure(mlxsw_sp_port, &hdroom, true);
}

static int mlxsw_sp_sb_port_init(struct mlxsw_sp *mlxsw_sp,
				 struct mlxsw_sp_sb_port *sb_port)
{
	struct mlxsw_sp_sb_pm *pms;

	pms = kcalloc(mlxsw_sp->sb_vals->pool_count, sizeof(*pms),
		      GFP_KERNEL);
	if (!pms)
		return -ENOMEM;
	sb_port->pms = pms;
	return 0;
}

static void mlxsw_sp_sb_port_fini(struct mlxsw_sp_sb_port *sb_port)
{
	kfree(sb_port->pms);
}

static int mlxsw_sp_sb_ports_init(struct mlxsw_sp *mlxsw_sp)
{
	unsigned int max_ports = mlxsw_core_max_ports(mlxsw_sp->core);
	struct mlxsw_sp_sb_pr *prs;
	int i;
	int err;

	mlxsw_sp->sb->ports = kcalloc(max_ports,
				      sizeof(struct mlxsw_sp_sb_port),
				      GFP_KERNEL);
	if (!mlxsw_sp->sb->ports)
		return -ENOMEM;

	prs = kcalloc(mlxsw_sp->sb_vals->pool_count, sizeof(*prs),
		      GFP_KERNEL);
	if (!prs) {
		err = -ENOMEM;
		goto err_alloc_prs;
	}
	mlxsw_sp->sb->prs = prs;

	for (i = 0; i < max_ports; i++) {
		err = mlxsw_sp_sb_port_init(mlxsw_sp, &mlxsw_sp->sb->ports[i]);
		if (err)
			goto err_sb_port_init;
	}

	return 0;

err_sb_port_init:
	for (i--; i >= 0; i--)
		mlxsw_sp_sb_port_fini(&mlxsw_sp->sb->ports[i]);
	kfree(mlxsw_sp->sb->prs);
err_alloc_prs:
	kfree(mlxsw_sp->sb->ports);
	return err;
}

static void mlxsw_sp_sb_ports_fini(struct mlxsw_sp *mlxsw_sp)
{
	int max_ports = mlxsw_core_max_ports(mlxsw_sp->core);
	int i;

	for (i = max_ports - 1; i >= 0; i--)
		mlxsw_sp_sb_port_fini(&mlxsw_sp->sb->ports[i]);
	kfree(mlxsw_sp->sb->prs);
	kfree(mlxsw_sp->sb->ports);
}

#define MLXSW_SP_SB_PR(_mode, _size)	\
	{				\
		.mode = _mode,		\
		.size = _size,		\
	}

#define MLXSW_SP_SB_PR_EXT(_mode, _size, _freeze_mode, _freeze_size)	\
	{								\
		.mode = _mode,						\
		.size = _size,						\
		.freeze_mode = _freeze_mode,				\
		.freeze_size = _freeze_size,				\
	}

#define MLXSW_SP1_SB_PR_CPU_SIZE	(256 * 1000)

/* Order according to mlxsw_sp1_sb_pool_dess */
static const struct mlxsw_sp_sb_pr mlxsw_sp1_sb_prs[] = {
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, MLXSW_SP_SB_REST),
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC, MLXSW_SP_SB_REST,
			   true, false),
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_STATIC, MLXSW_SP_SB_INFI,
			   true, true),
	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC,
			   MLXSW_SP1_SB_PR_CPU_SIZE, true, false),
	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC,
			   MLXSW_SP1_SB_PR_CPU_SIZE, true, false),
};

#define MLXSW_SP2_SB_PR_CPU_SIZE	(256 * 1000)

/* Order according to mlxsw_sp2_sb_pool_dess */
static const struct mlxsw_sp_sb_pr mlxsw_sp2_sb_prs[] = {
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, MLXSW_SP_SB_REST),
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),
	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC, MLXSW_SP_SB_REST,
			   true, false),
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),
	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),
	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_STATIC, MLXSW_SP_SB_INFI,
			   true, true),
	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC,
			   MLXSW_SP2_SB_PR_CPU_SIZE, true, false),
	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC,
			   MLXSW_SP2_SB_PR_CPU_SIZE, true, false),
};

static int mlxsw_sp_sb_prs_init(struct mlxsw_sp *mlxsw_sp,
				const struct mlxsw_sp_sb_pr *prs,
				const struct mlxsw_sp_sb_pool_des *pool_dess,
				size_t prs_len)
{
	/* Round down, unlike mlxsw_sp_bytes_cells(). */
	u32 sb_cells = div_u64(mlxsw_sp->sb->sb_size, mlxsw_sp->sb->cell_size);
	u32 rest_cells[2] = {sb_cells, sb_cells};
	int i;
	int err;

	/* Calculate how much space to give to the "REST" pools in either
	 * direction.
	 */
	for (i = 0; i < prs_len; i++) {
		enum mlxsw_reg_sbxx_dir dir = pool_dess[i].dir;
		u32 size = prs[i].size;
		u32 size_cells;

		if (size == MLXSW_SP_SB_INFI || size == MLXSW_SP_SB_REST)
			continue;

		size_cells = mlxsw_sp_bytes_cells(mlxsw_sp, size);
		if (WARN_ON_ONCE(size_cells > rest_cells[dir]))
			continue;

		rest_cells[dir] -= size_cells;
	}

	for (i = 0; i < prs_len; i++) {
		u32 size = prs[i].size;
		u32 size_cells;

		if (size == MLXSW_SP_SB_INFI) {
			err = mlxsw_sp_sb_pr_write(mlxsw_sp, i, prs[i].mode,
						   0, true);
		} else if (size == MLXSW_SP_SB_REST) {
			size_cells = rest_cells[pool_dess[i].dir];
			err = mlxsw_sp_sb_pr_write(mlxsw_sp, i, prs[i].mode,
						   size_cells, false);
		} else {
			size_cells = mlxsw_sp_bytes_cells(mlxsw_sp, size);
			err = mlxsw_sp_sb_pr_write(mlxsw_sp, i, prs[i].mode,
						   size_cells, false);
		}
		if (err)
			return err;
	}

	err = mlxsw_sp_sb_pr_desc_write(mlxsw_sp, MLXSW_REG_SBXX_DIR_INGRESS,
					MLXSW_REG_SBPR_MODE_DYNAMIC, 0, true);
	if (err)
		return err;

	err = mlxsw_sp_sb_pr_desc_write(mlxsw_sp, MLXSW_REG_SBXX_DIR_EGRESS,
					MLXSW_REG_SBPR_MODE_DYNAMIC, 0, true);
	if (err)
		return err;

	return 0;
}

#define MLXSW_SP_SB_CM(_min_buff, _max_buff, _pool)	\
	{						\
		.min_buff = _min_buff,			\
		.max_buff = _max_buff,			\
		.pool_index = _pool,			\
	}

#define MLXSW_SP_SB_CM_ING(_min_buff, _max_buff)	\
	{						\
		.min_buff = _min_buff,			\
		.max_buff = _max_buff,			\
		.pool_index = MLXSW_SP_SB_POOL_ING,	\
	}

#define MLXSW_SP_SB_CM_EGR(_min_buff, _max_buff)	\
	{						\
		.min_buff = _min_buff,			\
		.max_buff = _max_buff,			\
		.pool_index = MLXSW_SP_SB_POOL_EGR,	\
	}

#define MLXSW_SP_SB_CM_EGR_MC(_min_buff, _max_buff)	\
	{						\
		.min_buff = _min_buff,			\
		.max_buff = _max_buff,			\
		.pool_index = MLXSW_SP_SB_POOL_EGR_MC,	\
		.freeze_pool = true,			\
		.freeze_thresh = true,			\
	}

static const struct mlxsw_sp_sb_cm mlxsw_sp1_sb_cms_ingress[] = {
	MLXSW_SP_SB_CM_ING(10000, 8),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, 0), /* dummy, this PG does not exist */
	MLXSW_SP_SB_CM(10000, 8, MLXSW_SP_SB_POOL_ING_CPU),
};

static const struct mlxsw_sp_sb_cm mlxsw_sp2_sb_cms_ingress[] = {
	MLXSW_SP_SB_CM_ING(0, 7),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_CM_ING(0, 0), /* dummy, this PG does not exist */
	MLXSW_SP_SB_CM(10000, 8, MLXSW_SP_SB_POOL_ING_CPU),
};

static const struct mlxsw_sp_sb_cm mlxsw_sp1_sb_cms_egress[] = {
	MLXSW_SP_SB_CM_EGR(1500, 9),
	MLXSW_SP_SB_CM_EGR(1500, 9),
	MLXSW_SP_SB_CM_EGR(1500, 9),
	MLXSW_SP_SB_CM_EGR(1500, 9),
	MLXSW_SP_SB_CM_EGR(1500, 9),
	MLXSW_SP_SB_CM_EGR(1500, 9),
	MLXSW_SP_SB_CM_EGR(1500, 9),
	MLXSW_SP_SB_CM_EGR(1500, 9),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR(1, 0xff),
};

static const struct mlxsw_sp_sb_cm mlxsw_sp2_sb_cms_egress[] = {
	MLXSW_SP_SB_CM_EGR(0, 7),
	MLXSW_SP_SB_CM_EGR(0, 7),
	MLXSW_SP_SB_CM_EGR(0, 7),
	MLXSW_SP_SB_CM_EGR(0, 7),
	MLXSW_SP_SB_CM_EGR(0, 7),
	MLXSW_SP_SB_CM_EGR(0, 7),
	MLXSW_SP_SB_CM_EGR(0, 7),
	MLXSW_SP_SB_CM_EGR(0, 7),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR_MC(0, MLXSW_SP_SB_INFI),
	MLXSW_SP_SB_CM_EGR(1, 0xff),
};

#define MLXSW_SP_CPU_PORT_SB_CM MLXSW_SP_SB_CM(0, 0, MLXSW_SP_SB_POOL_EGR_CPU)

static const struct mlxsw_sp_sb_cm mlxsw_sp_cpu_port_sb_cms[] = {
	MLXSW_SP_SB_CM(1000, 8, MLXSW_SP_SB_POOL_EGR_CPU),
	MLXSW_SP_SB_CM(1000, 8, MLXSW_SP_SB_POOL_EGR_CPU),
	MLXSW_SP_SB_CM(1000, 8, MLXSW_SP_SB_POOL_EGR_CPU),
	MLXSW_SP_SB_CM(1000, 8, MLXSW_SP_SB_POOL_EGR_CPU),
	MLXSW_SP_SB_CM(1000, 8, MLXSW_SP_SB_POOL_EGR_CPU),
	MLXSW_SP_SB_CM(1000, 8, MLXSW_SP_SB_POOL_EGR_CPU),
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_SB_CM(1000, 8, MLXSW_SP_SB_POOL_EGR_CPU),
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
	MLXSW_SP_CPU_PORT_SB_CM,
};

static bool
mlxsw_sp_sb_pool_is_static(struct mlxsw_sp *mlxsw_sp, u16 pool_index)
{
	struct mlxsw_sp_sb_pr *pr = mlxsw_sp_sb_pr_get(mlxsw_sp, pool_index);

	return pr->mode == MLXSW_REG_SBPR_MODE_STATIC;
}

static int __mlxsw_sp_sb_cms_init(struct mlxsw_sp *mlxsw_sp, u16 local_port,
				  enum mlxsw_reg_sbxx_dir dir,
				  const struct mlxsw_sp_sb_cm *cms,
				  size_t cms_len)
{
	const struct mlxsw_sp_sb_vals *sb_vals = mlxsw_sp->sb_vals;
	int i;
	int err;

	for (i = 0; i < cms_len; i++) {
		const struct mlxsw_sp_sb_cm *cm;
		u32 min_buff;
		u32 max_buff;

		if (i == 8 && dir == MLXSW_REG_SBXX_DIR_INGRESS)
			continue; /* PG number 8 does not exist, skip it */
		cm = &cms[i];
		if (WARN_ON(sb_vals->pool_dess[cm->pool_index].dir != dir))
			continue;

		min_buff = mlxsw_sp_bytes_cells(mlxsw_sp, cm->min_buff);
		max_buff = cm->max_buff;
		if (max_buff == MLXSW_SP_SB_INFI) {
			err = mlxsw_sp_sb_cm_write(mlxsw_sp, local_port, i,
						   min_buff, 0,
						   true, cm->pool_index);
		} else {
			if (mlxsw_sp_sb_pool_is_static(mlxsw_sp,
						       cm->pool_index))
				max_buff = mlxsw_sp_bytes_cells(mlxsw_sp,
								max_buff);
			err = mlxsw_sp_sb_cm_write(mlxsw_sp, local_port, i,
						   min_buff, max_buff,
						   false, cm->pool_index);
		}
		if (err)
			return err;
	}
	return 0;
}

static int mlxsw_sp_port_sb_cms_init(struct mlxsw_sp_port *mlxsw_sp_port)
{
	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
	int err;

	err = __mlxsw_sp_sb_cms_init(mlxsw_sp,
				     mlxsw_sp_port->local_port,
				     MLXSW_REG_SBXX_DIR_INGRESS,
				     mlxsw_sp->sb_vals->cms_ingress,
				     mlxsw_sp->sb_vals->cms_ingress_count);
	if (err)
		return err;
	return __mlxsw_sp_sb_cms_init(mlxsw_sp_port->mlxsw_sp,
				      mlxsw_sp_port->local_port,
				      MLXSW_REG_SBXX_DIR_EGRESS,
				      mlxsw_sp->sb_vals->cms_egress,
				      mlxsw_sp->sb_vals->cms_egress_count);
}

static int mlxsw_sp_cpu_port_sb_cms_init(struct mlxsw_sp *mlxsw_sp)
{
	return __mlxsw_sp_sb_cms_init(mlxsw_sp, 0, MLXSW_REG_SBXX_DIR_EGRESS,
				      mlxsw_sp->sb_vals->cms_cpu,
				      mlxsw_sp->sb_vals->cms_cpu_count);
}

#define MLXSW_SP_SB_PM(_min_buff, _max_buff)	\
	{					\
		.min_buff = _min_buff,		\
		.max_buff = _max_buff,		\
	}

/* Order according to mlxsw_sp1_sb_pool_dess */
static const struct mlxsw_sp_sb_pm mlxsw_sp1_sb_pms[] = {
	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MAX),
	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_PM(0, 7),
	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
	MLXSW_SP_SB_PM(10000, 90000),
	MLXSW_SP_SB_PM(0, 8),	/* 50% occupancy */
	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
};

/* Order according to mlxsw_sp2_sb_pool_dess */
static const struct mlxsw_sp_sb_pm mlxsw_sp2_sb_pms[] = {
	MLXSW_SP_SB_PM(0, 7),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 7),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(10000, 90000),
	MLXSW_SP_SB_PM(0, 8),	/* 50% occupancy */
	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
};

/* Order according to mlxsw_sp*_sb_pool_dess */
static const struct mlxsw_sp_sb_pm mlxsw_sp_cpu_port_sb_pms[] = {
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, 90000),
	MLXSW_SP_SB_PM(0, 0),
	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MAX),
};

static int mlxsw_sp_sb_pms_init(struct mlxsw_sp *mlxsw_sp, u16 local_port,
				const struct mlxsw_sp_sb_pm *pms,
				bool skip_ingress)
{
	int i, err;

	for (i = 0; i < mlxsw_sp->sb_vals->pool_count; i++) {
		const struct mlxsw_sp_sb_pm *pm = &pms[i];
		const struct mlxsw_sp_sb_pool_des *des;
		u32 max_buff;
		u32 min_buff;

		des = &mlxsw_sp->sb_vals->pool_dess[i];
		if (skip_ingress && des->dir == MLXSW_REG_SBXX_DIR_INGRESS)
			continue;

		min_buff = mlxsw_sp_bytes_cells(mlxsw_sp, pm->min_buff);
		max_buff = pm->max_buff;
		if (mlxsw_sp_sb_pool_is_static(mlxsw_sp, i))
			max_buff = mlxsw_sp_bytes_cells(mlxsw_sp, max_buff);
		err = mlxsw_sp_sb_pm_write(mlxsw_sp, local_port, i, min_buff,
					   max_buff);
		if (err)
			return err;
	}
	return 0;
}

static int mlxsw_sp_port_sb_pms_init(struct mlxsw_sp_port *mlxsw_sp_port)
{
	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;

	return mlxsw_sp_sb_pms_init(mlxsw_sp, mlxsw_sp_port->local_port,
				    mlxsw_sp->sb_vals->pms, false);
}

static int mlxsw_sp_cpu_port_sb_pms_init(struct mlxsw_sp *mlxsw_sp)
{
	return mlxsw_sp_sb_pms_init(mlxsw_sp, 0, mlxsw_sp->sb_vals->pms_cpu,
				    true);
}

#define MLXSW_SP_SB_MM(_min_buff, _max_buff)		\
	{						\
		.min_buff = _min_buff,			\
		.max_buff = _max_buff,			\
		.pool_index = MLXSW_SP_SB_POOL_EGR,	\
	}

static const struct mlxsw_sp_sb_mm mlxsw_sp_sb_mms[] = {
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
	MLXSW_SP_SB_MM(0, 6),
};

static int mlxsw_sp_sb_mms_init(struct mlxsw_sp *mlxsw_sp)
{
	char sbmm_pl[MLXSW_REG_SBMM_LEN];
	int i;
	int err;

	for (i = 0; i < mlxsw_sp->sb_vals->mms_count; i++) {
		const struct mlxsw_sp_sb_pool_des *des;
		const struct mlxsw_sp_sb_mm *mc;
		u32 min_buff;

		mc = &mlxsw_sp->sb_vals->mms[i];
		des = &mlxsw_sp->sb_vals->pool_dess[mc->pool_index];
		/* All pools used by sb_mm's are initialized using dynamic
		 * thresholds, therefore 'max_buff' isn't specified in cells.
		 */
		min_buff = mlxsw_sp_bytes_cells(mlxsw_sp, mc->min_buff);
		mlxsw_reg_sbmm_pack(sbmm_pl, i, min_buff, mc->max_buff,
				    des->pool);
		err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbmm), sbmm_pl);
		if (err)
			return err;
	}
	return 0;
}

static void mlxsw_sp_pool_count(struct mlxsw_sp *mlxsw_sp,
				u16 *p_ingress_len, u16 *p_egress_len)
{
	int i;

	for (i = 0; i < mlxsw_sp->sb_vals->pool_count; ++i) {
		if (mlxsw_sp->sb_vals->pool_dess[i].dir ==
		    MLXSW_REG_SBXX_DIR_INGRESS)
			(*p_ingress_len)++;
		else
			(*p_egress_len)++;
	}

	WARN(*p_egress_len == 0, "No egress pools\n");
}

const struct mlxsw_sp_sb_vals mlxsw_sp1_sb_vals = {
	.pool_count = ARRAY_SIZE(mlxsw_sp1_sb_pool_dess),
	.pool_dess = mlxsw_sp1_sb_pool_dess,
	.pms = mlxsw_sp1_sb_pms,
	.pms_cpu = mlxsw_sp_cpu_port_sb_pms,
	.prs = mlxsw_sp1_sb_prs,
	.mms = mlxsw_sp_sb_mms,
	.cms_ingress = mlxsw_sp1_sb_cms_ingress,
	.cms_egress = mlxsw_sp1_sb_cms_egress,
	.cms_cpu = mlxsw_sp_cpu_port_sb_cms,
	.mms_count = ARRAY_SIZE(mlxsw_sp_sb_mms),
	.cms_ingress_count = ARRAY_SIZE(mlxsw_sp1_sb_cms_ingress),
	.cms_egress_count = ARRAY_SIZE(mlxsw_sp1_sb_cms_egress),
	.cms_cpu_count = ARRAY_SIZE(mlxsw_sp_cpu_port_sb_cms),
};

const struct mlxsw_sp_sb_vals mlxsw_sp2_sb_vals = {
	.pool_count = ARRAY_SIZE(mlxsw_sp2_sb_pool_dess),
	.pool_dess = mlxsw_sp2_sb_pool_dess,
	.pms = mlxsw_sp2_sb_pms,
	.pms_cpu = mlxsw_sp_cpu_port_sb_pms,
	.prs = mlxsw_sp2_sb_prs,
	.mms = mlxsw_sp_sb_mms,
	.cms_ingress = mlxsw_sp2_sb_cms_ingress,
	.cms_egress = mlxsw_sp2_sb_cms_egress,
	.cms_cpu = mlxsw_sp_cpu_port_sb_cms,
	.mms_count = ARRAY_SIZE(mlxsw_sp_sb_mms),
	.cms_ingress_count = ARRAY_SIZE(mlxsw_sp2_sb_cms_ingress),
	.cms_egress_count = ARRAY_SIZE(mlxsw_sp2_sb_cms_egress),
	.cms_cpu_count = ARRAY_SIZE(mlxsw_sp_cpu_port_sb_cms),
};

static u32 mlxsw_sp1_pb_int_buf_size_get(int mtu, u32 speed)
{
	return mtu * 5 / 2;
}

static u32 __mlxsw_sp_pb_int_buf_size_get(int mtu, u32 speed, u32 buffer_factor)
{
	return 3 * mtu + buffer_factor * speed / 1000;
}

#define MLXSW_SP2_SPAN_EG_MIRROR_BUFFER_FACTOR 38

static u32 mlxsw_sp2_pb_int_buf_size_get(int mtu, u32 speed)
{
	int factor = MLXSW_SP2_SPAN_EG_MIRROR_BUFFER_FACTOR;

	return __mlxsw_sp_pb_int_buf_size_get(mtu, speed, factor);
}

#define MLXSW_SP3_SPAN_EG_MIRROR_BUFFER_FACTOR 50

static u32 mlxsw_sp3_pb_int_buf_size_get(int mtu, u32 speed)
{
	int factor = MLXSW_SP3_SPAN_EG_MIRROR_BUFFER_FACTOR;

	return __mlxsw_sp_pb_int_buf_size_get(mtu, speed, factor);
}

const struct mlxsw_sp_sb_ops mlxsw_sp1_sb_ops = {
	.int_buf_size_get = mlxsw_sp1_pb_int_buf_size_get,
};

const struct mlxsw_sp_sb_ops mlxsw_sp2_sb_ops = {
	.int_buf_size_get = mlxsw_sp2_pb_int_buf_size_get,
};

const struct mlxsw_sp_sb_ops mlxsw_sp3_sb_ops = {
	.int_buf_size_get = mlxsw_sp3_pb_int_buf_size_get,
};

int mlxsw_sp_buffers_init(struct mlxsw_sp *mlxsw_sp)
{
	u32 max_headroom_size;
	u16 ing_pool_count = 0;
	u16 eg_pool_count = 0;
	int err;

	if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, CELL_SIZE))
		return -EIO;

	if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, GUARANTEED_SHARED_BUFFER))
		return -EIO;

	if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, MAX_HEADROOM_SIZE))
		return -EIO;

	mlxsw_sp->sb = kzalloc(sizeof(*mlxsw_sp->sb), GFP_KERNEL);
	if (!mlxsw_sp->sb)
		return -ENOMEM;
	mlxsw_sp->sb->cell_size = MLXSW_CORE_RES_GET(mlxsw_sp->core, CELL_SIZE);
	mlxsw_sp->sb->sb_size = MLXSW_CORE_RES_GET(mlxsw_sp->core,
						   GUARANTEED_SHARED_BUFFER);
	max_headroom_size = MLXSW_CORE_RES_GET(mlxsw_sp->core,
					       MAX_HEADROOM_SIZE);
	/* Round down, because this limit must not be overstepped. */
	mlxsw_sp->sb->max_headroom_cells = max_headroom_size /
						mlxsw_sp->sb->cell_size;

	err = mlxsw_sp_sb_ports_init(mlxsw_sp);
	if (err)
		goto err_sb_ports_init;
	err = mlxsw_sp_sb_prs_init(mlxsw_sp, mlxsw_sp->sb_vals->prs,
				   mlxsw_sp->sb_vals->pool_dess,
				   mlxsw_sp->sb_vals->pool_count);
	if (err)
		goto err_sb_prs_init;
	err = mlxsw_sp_cpu_port_sb_cms_init(mlxsw_sp);
	if (err)
		goto err_sb_cpu_port_sb_cms_init;
	err = mlxsw_sp_cpu_port_sb_pms_init(mlxsw_sp);
	if (err)
		goto err_sb_cpu_port_pms_init;
	err = mlxsw_sp_sb_mms_init(mlxsw_sp);
	if (err)
		goto err_sb_mms_init;
	mlxsw_sp_pool_count(mlxsw_sp, &ing_pool_count, &eg_pool_count);
	err = devl_sb_register(priv_to_devlink(mlxsw_sp->core), 0,
			       mlxsw_sp->sb->sb_size,
			       ing_pool_count,
			       eg_pool_count,
			       MLXSW_SP_SB_ING_TC_COUNT,
			       MLXSW_SP_SB_EG_TC_COUNT);
	if (err)
		goto err_devlink_sb_register;

	return 0;

err_devlink_sb_register:
err_sb_mms_init:
err_sb_cpu_port_pms_init:
err_sb_cpu_port_sb_cms_init:
err_sb_prs_init:
	mlxsw_sp_sb_ports_fini(mlxsw_sp);
err_sb_ports_init:
	kfree(mlxsw_sp->sb);
	return err;
}

void mlxsw_sp_buffers_fini(struct mlxsw_sp *mlxsw_sp)
{
	devl_sb_unregister(priv_to_devlink(mlxsw_sp->core), 0);
	mlxsw_sp_sb_ports_fini(mlxsw_sp);
	kfree(mlxsw_sp->sb);
}

int mlxsw_sp_port_buffers_init(struct mlxsw_sp_port *mlxsw_sp_port)
{
	int err;

	mlxsw_sp_port->hdroom = kzalloc(sizeof(*mlxsw_sp_port->hdroom), GFP_KERNEL);
	if (!mlxsw_sp_port->hdroom)
		return -ENOMEM;
	mlxsw_sp_port->hdroom->mtu = mlxsw_sp_port->dev->mtu;

	err = mlxsw_sp_port_headroom_init(mlxsw_sp_port);
	if (err)
		goto err_headroom_init;
	err = mlxsw_sp_port_sb_cms_init(mlxsw_sp_port);
	if (err)
		goto err_port_sb_cms_init;
	err = mlxsw_sp_port_sb_pms_init(mlxsw_sp_port);
	if (err)
		goto err_port_sb_pms_init;
	return 0;

err_port_sb_pms_init:
err_port_sb_cms_init:
err_headroom_init:
	kfree(mlxsw_sp_port->hdroom);
	return err;
}

void mlxsw_sp_port_buffers_fini(struct mlxsw_sp_port *mlxsw_sp_port)
{
	kfree(mlxsw_sp_port->hdroom);
}

int mlxsw_sp_sb_pool_get(struct mlxsw_core *mlxsw_core,
			 unsigned int sb_index, u16 pool_index,
			 struct devlink_sb_pool_info *pool_info)
{
	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
	enum mlxsw_reg_sbxx_dir dir;
	struct mlxsw_sp_sb_pr *pr;

	dir = mlxsw_sp->sb_vals->pool_dess[pool_index].dir;
	pr = mlxsw_sp_sb_pr_get(mlxsw_sp, pool_index);
	pool_info->pool_type = (enum devlink_sb_pool_type) dir;
	pool_info->size = mlxsw_sp_cells_bytes(mlxsw_sp, pr->size);
	pool_info->threshold_type = (enum devlink_sb_threshold_type) pr->mode;
	pool_info->cell_size = mlxsw_sp->sb->cell_size;
	return 0;
}

int mlxsw_sp_sb_pool_set(struct mlxsw_core *mlxsw_core,
			 unsigned int sb_index, u16 pool_index, u32 size,
			 enum devlink_sb_threshold_type threshold_type,
			 struct netlink_ext_ack *extack)
{
	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
	u32 pool_size = mlxsw_sp_bytes_cells(mlxsw_sp, size);
	const struct mlxsw_sp_sb_pr *pr;
	enum mlxsw_reg_sbpr_mode mode;

	mode = (enum mlxsw_reg_sbpr_mode) threshold_type;
	pr = &mlxsw_sp->sb_vals->prs[pool_index];

	if (size > MLXSW_CORE_RES_GET(mlxsw_sp->core,
				      GUARANTEED_SHARED_BUFFER)) {
		NL_SET_ERR_MSG_MOD(extack, "Exceeded shared buffer size");
		return -EINVAL;
	}

	if (pr->freeze_mode && pr->mode != mode) {
		NL_SET_ERR_MSG_MOD(extack, "Changing this pool's threshold type is forbidden");
		return -EINVAL;
	}

	if (pr->freeze_size && pr->size != size) {
		NL_SET_ERR_MSG_MOD(extack, "Changing this pool's size is forbidden");
		return -EINVAL;
	}

	return mlxsw_sp_sb_pr_write(mlxsw_sp, pool_index, mode,
				    pool_size, false);
}

#define MLXSW_SP_SB_THRESHOLD_TO_ALPHA_OFFSET (-2) /* 3->1, 16->14 */

static u32 mlxsw_sp_sb_threshold_out(struct mlxsw_sp *mlxsw_sp, u16 pool_index,
				     u32 max_buff)
{
	struct mlxsw_sp_sb_pr *pr = mlxsw_sp_sb_pr_get(mlxsw_sp, pool_index);

	if (pr->mode == MLXSW_REG_SBPR_MODE_DYNAMIC)
		return max_buff - MLXSW_SP_SB_THRESHOLD_TO_ALPHA_OFFSET;
	return mlxsw_sp_cells_bytes(mlxsw_sp, max_buff);
}

static int mlxsw_sp_sb_threshold_in(struct mlxsw_sp *mlxsw_sp, u16 pool_index,
				    u32 threshold, u32 *p_max_buff,
				    struct netlink_ext_ack *extack)
{
	struct mlxsw_sp_sb_pr *pr = mlxsw_sp_sb_pr_get(mlxsw_sp, pool_index);

	if (pr->mode == MLXSW_REG_SBPR_MODE_DYNAMIC) {
		int val;

		val = threshold + MLXSW_SP_SB_THRESHOLD_TO_ALPHA_OFFSET;
		if (val < MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN ||
		    val > MLXSW_REG_SBXX_DYN_MAX_BUFF_MAX) {
			NL_SET_ERR_MSG_MOD(extack, "Invalid dynamic threshold value");
			return -EINVAL;
		}
		*p_max_buff = val;
	} else {
		*p_max_buff = mlxsw_sp_bytes_cells(mlxsw_sp, threshold);
	}
	return 0;
}

int mlxsw_sp_sb_port_pool_get(struct mlxsw_core_port *mlxsw_core_port,
			      unsigned int sb_index, u16 pool_index,
			      u32 *p_threshold)
{
	struct mlxsw_sp_port *mlxsw_sp_port =
			mlxsw_core_port_driver_priv(mlxsw_core_port);
	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
	u16 local_port = mlxsw_sp_port->local_port;
	struct mlxsw_sp_sb_pm *pm = mlxsw_sp_sb_pm_get(mlxsw_sp, local_port,
						       pool_index);

	*p_threshold = mlxsw_sp_sb_threshold_out(mlxsw_sp, pool_index,
						 pm->max_buff);
	return 0;
}

int mlxsw_sp_sb_port_pool_set(struct mlxsw_core_port *mlxsw_core_port,
			      unsigned int sb_index, u16 pool_index,
			      u32 threshold, struct netlink_ext_ack *extack)
{
	struct mlxsw_sp_port *mlxsw_sp_port =
			mlxsw_core_port_driver_priv(mlxsw_core_port);
	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
	u16 local_port = mlxsw_sp_port->local_port;
	u32 max_buff;
	int err;

	if (local_port == MLXSW_PORT_CPU_PORT) {
		NL_SET_ERR_MSG_MOD(extack, "Changing CPU port's threshold is forbidden");
		return -EINVAL;
	}

	err = mlxsw_sp_sb_threshold_in(mlxsw_sp, pool_index,
				       threshold, &max_buff, extack);
	if (err)
		return err;

	return mlxsw_sp_sb_pm_write(mlxsw_sp, local_port, pool_index,
				    0, max_buff);
}

int mlxsw_sp_sb_tc_pool_bind_get(struct mlxsw_core_port *mlxsw_core_port,
				 unsigned int sb_index, u16 tc_index,
				 enum devlink_sb_pool_type pool_type,
				 u16 *p_pool_index, u32 *p_threshold)
{
	struct mlxsw_sp_port *mlxsw_sp_port =
			mlxsw_core_port_driver_priv(mlxsw_core_port);
	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
	u16 local_port = mlxsw_sp_port->local_port;
	u8 pg_buff = tc_index;
	enum mlxsw_reg_sbxx_dir dir = (enum mlxsw_reg_sbxx_dir) pool_type;
	struct mlxsw_sp_sb_cm *cm = mlxsw_sp_sb_cm_get(mlxsw_sp, local_port,
						       pg_buff, dir);

	*p_threshold = mlxsw_sp_sb_threshold_out(mlxsw_sp, cm->pool_index,
						 cm->max_buff);
	*p_pool_index = cm->pool_index;
	return 0;
}

int mlxsw_sp_sb_tc_pool_bind_set(struct mlxsw_core_port *mlxsw_core_port,
				 unsigned int sb_index, u16 tc_index,
				 enum devlink_sb_pool_type pool_type,
				 u16 pool_index, u32 threshold,
				 struct netlink_ext_ack *extack)
{
	struct mlxsw_sp_port *mlxsw_sp_port =
			mlxsw_core_port_driver_priv(mlxsw_core_port);
	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
	u16 local_port = mlxsw_sp_port->local_port;
	const struct mlxsw_sp_sb_cm *cm;
	u8 pg_buff = tc_index;
	enum mlxsw_reg_sbxx_dir dir = (enum mlxsw_reg_sbxx_dir) pool_type;
	u32 max_buff;
	int err;

	if (local_port == MLXSW_PORT_CPU_PORT) {
		NL_SET_ERR_MSG_MOD(extack, "Changing CPU port's binding is forbidden");
		return -EINVAL;
	}

	if (dir != mlxsw_sp->sb_vals->pool_dess[pool_index].dir) {
		NL_SET_ERR_MSG_MOD(extack, "Binding egress TC to ingress pool and vice versa is forbidden");
		return -EINVAL;
	}

	if (dir == MLXSW_REG_SBXX_DIR_INGRESS)
		cm = &mlxsw_sp->sb_vals->cms_ingress[tc_index];
	else
		cm = &mlxsw_sp->sb_vals->cms_egress[tc_index];

	if (cm->freeze_pool && cm->pool_index != pool_index) {
		NL_SET_ERR_MSG_MOD(extack, "Binding this TC to a different pool is forbidden");
		return -EINVAL;
	}

	if (cm->freeze_thresh && cm->max_buff != threshold) {
		NL_SET_ERR_MSG_MOD(extack, "Changing this TC's threshold is forbidden");
		return -EINVAL;
	}

	err = mlxsw_sp_sb_threshold_in(mlxsw_sp, pool_index,
				       threshold, &max_buff, extack);
	if (err)
		return err;

	return mlxsw_sp_sb_cm_write(mlxsw_sp, local_port, pg_buff,
				    0, max_buff, false, pool_index);
}

#define MASKED_COUNT_MAX \
	(MLXSW_REG_SBSR_REC_MAX_COUNT / \
	 (MLXSW_SP_SB_ING_TC_COUNT + MLXSW_SP_SB_EG_TC_COUNT))

struct mlxsw_sp_sb_sr_occ_query_cb_ctx {
	u8 masked_count;
	u16 local_port_1;
};

static void mlxsw_sp_sb_sr_occ_query_cb(struct mlxsw_core *mlxsw_core,
					char *sbsr_pl, size_t sbsr_pl_len,
					unsigned long cb_priv)
{
	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
	struct mlxsw_sp_sb_sr_occ_query_cb_ctx cb_ctx;
	u8 masked_count;
	u16 local_port;
	int rec_index = 0;
	struct mlxsw_sp_sb_cm *cm;
	int i;

	memcpy(&cb_ctx, &cb_priv, sizeof(cb_ctx));

	masked_count = 0;
	for (local_port = cb_ctx.local_port_1;
	     local_port < mlxsw_core_max_ports(mlxsw_core); local_port++) {
		if (!mlxsw_sp->ports[local_port])
			continue;
		if (local_port == MLXSW_PORT_CPU_PORT) {
			/* Ingress quotas are not supported for the CPU port */
			masked_count++;
			continue;
		}
		for (i = 0; i < MLXSW_SP_SB_ING_TC_COUNT; i++) {
			cm = mlxsw_sp_sb_cm_get(mlxsw_sp, local_port, i,
						MLXSW_REG_SBXX_DIR_INGRESS);
			mlxsw_reg_sbsr_rec_unpack(sbsr_pl, rec_index++,
						  &cm->occ.cur, &cm->occ.max);
		}
		if (++masked_count == cb_ctx.masked_count)
			break;
	}
	masked_count = 0;
	for (local_port = cb_ctx.local_port_1;
	     local_port < mlxsw_core_max_ports(mlxsw_core); local_port++) {
		if (!mlxsw_sp->ports[local_port])
			continue;
		for (i = 0; i < MLXSW_SP_SB_EG_TC_COUNT; i++) {
			cm = mlxsw_sp_sb_cm_get(mlxsw_sp, local_port, i,
						MLXSW_REG_SBXX_DIR_EGRESS);
			mlxsw_reg_sbsr_rec_unpack(sbsr_pl, rec_index++,
						  &cm->occ.cur, &cm->occ.max);
		}
		if (++masked_count == cb_ctx.masked_count)
			break;
	}
}

int mlxsw_sp_sb_occ_snapshot(struct mlxsw_core *mlxsw_core,
			     unsigned int sb_index)
{
	u16 local_port, local_port_1, first_local_port, last_local_port;
	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
	struct mlxsw_sp_sb_sr_occ_query_cb_ctx cb_ctx;
	u8 masked_count, current_page = 0;
	unsigned long cb_priv = 0;
	LIST_HEAD(bulk_list);
	char *sbsr_pl;
	int i;
	int err;
	int err2;

	sbsr_pl = kmalloc(MLXSW_REG_SBSR_LEN, GFP_KERNEL);
	if (!sbsr_pl)
		return -ENOMEM;

	local_port = MLXSW_PORT_CPU_PORT;
next_batch:
	local_port_1 = local_port;
	masked_count = 0;
	mlxsw_reg_sbsr_pack(sbsr_pl, false);
	mlxsw_reg_sbsr_port_page_set(sbsr_pl, current_page);
	first_local_port = current_page * MLXSW_REG_SBSR_NUM_PORTS_IN_PAGE;
	last_local_port = current_page * MLXSW_REG_SBSR_NUM_PORTS_IN_PAGE +
			  MLXSW_REG_SBSR_NUM_PORTS_IN_PAGE - 1;

	for (i = 0; i < MLXSW_SP_SB_ING_TC_COUNT; i++)
		mlxsw_reg_sbsr_pg_buff_mask_set(sbsr_pl, i, 1);
	for (i = 0; i < MLXSW_SP_SB_EG_TC_COUNT; i++)
		mlxsw_reg_sbsr_tclass_mask_set(sbsr_pl, i, 1);
	for (; local_port < mlxsw_core_max_ports(mlxsw_core); local_port++) {
		if (!mlxsw_sp->ports[local_port])
			continue;
		if (local_port > last_local_port) {
			current_page++;
			goto do_query;
		}
		if (local_port != MLXSW_PORT_CPU_PORT) {
			/* Ingress quotas are not supported for the CPU port */
			mlxsw_reg_sbsr_ingress_port_mask_set(sbsr_pl,
							     local_port - first_local_port,
							     1);
		}
		mlxsw_reg_sbsr_egress_port_mask_set(sbsr_pl,
						    local_port - first_local_port,
						    1);
		for (i = 0; i < mlxsw_sp->sb_vals->pool_count; i++) {
			err = mlxsw_sp_sb_pm_occ_query(mlxsw_sp, local_port, i,
						       &bulk_list);
			if (err)
				goto out;
		}
		if (++masked_count == MASKED_COUNT_MAX)
			goto do_query;
	}

do_query:
	cb_ctx.masked_count = masked_count;
	cb_ctx.local_port_1 = local_port_1;
	memcpy(&cb_priv, &cb_ctx, sizeof(cb_ctx));
	err = mlxsw_reg_trans_query(mlxsw_core, MLXSW_REG(sbsr), sbsr_pl,
				    &bulk_list, mlxsw_sp_sb_sr_occ_query_cb,
				    cb_priv);
	if (err)
		goto out;
	if (local_port < mlxsw_core_max_ports(mlxsw_core)) {
		local_port++;
		goto next_batch;
	}

out:
	err2 = mlxsw_reg_trans_bulk_wait(&bulk_list);
	if (!err)
		err = err2;
	kfree(sbsr_pl);
	return err;
}

int mlxsw_sp_sb_occ_max_clear(struct mlxsw_core *mlxsw_core,
			      unsigned int sb_index)
{
	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
	u16 local_port, first_local_port, last_local_port;
	LIST_HEAD(bulk_list);
	unsigned int masked_count;
	u8 current_page = 0;
	char *sbsr_pl;
	int i;
	int err;
	int err2;

	sbsr_pl = kmalloc(MLXSW_REG_SBSR_LEN, GFP_KERNEL);
	if (!sbsr_pl)
		return -ENOMEM;

	local_port = MLXSW_PORT_CPU_PORT;
next_batch:
	masked_count = 0;
	mlxsw_reg_sbsr_pack(sbsr_pl, true);
	mlxsw_reg_sbsr_port_page_set(sbsr_pl, current_page);
	first_local_port = current_page * MLXSW_REG_SBSR_NUM_PORTS_IN_PAGE;
	last_local_port = current_page * MLXSW_REG_SBSR_NUM_PORTS_IN_PAGE +
			  MLXSW_REG_SBSR_NUM_PORTS_IN_PAGE - 1;

	for (i = 0; i < MLXSW_SP_SB_ING_TC_COUNT; i++)
		mlxsw_reg_sbsr_pg_buff_mask_set(sbsr_pl, i, 1);
	for (i = 0; i < MLXSW_SP_SB_EG_TC_COUNT; i++)
		mlxsw_reg_sbsr_tclass_mask_set(sbsr_pl, i, 1);
	for (; local_port < mlxsw_core_max_ports(mlxsw_core); local_port++) {
		if (!mlxsw_sp->ports[local_port])
			continue;
		if (local_port > last_local_port) {
			current_page++;
			goto do_query;
		}
		if (local_port != MLXSW_PORT_CPU_PORT) {
			/* Ingress quotas are not supported for the CPU port */
			mlxsw_reg_sbsr_ingress_port_mask_set(sbsr_pl,
							     local_port - first_local_port,
							     1);
		}
		mlxsw_reg_sbsr_egress_port_mask_set(sbsr_pl,
						    local_port - first_local_port,
						    1);
		for (i = 0; i < mlxsw_sp->sb_vals->pool_count; i++) {
			err = mlxsw_sp_sb_pm_occ_clear(mlxsw_sp, local_port, i,
						       &bulk_list);
			if (err)
				goto out;
		}
		if (++masked_count == MASKED_COUNT_MAX)
			goto do_query;
	}

do_query:
	err = mlxsw_reg_trans_query(mlxsw_core, MLXSW_REG(sbsr), sbsr_pl,
				    &bulk_list, NULL, 0);
	if (err)
		goto out;
	if (local_port < mlxsw_core_max_ports(mlxsw_core)) {
		local_port++;
		goto next_batch;
	}

out:
	err2 = mlxsw_reg_trans_bulk_wait(&bulk_list);
	if (!err)
		err = err2;
	kfree(sbsr_pl);
	return err;
}

int mlxsw_sp_sb_occ_port_pool_get(struct mlxsw_core_port *mlxsw_core_port,
				  unsigned int sb_index, u16 pool_index,
				  u32 *p_cur, u32 *p_max)
{
	struct mlxsw_sp_port *mlxsw_sp_port =
			mlxsw_core_port_driver_priv(mlxsw_core_port);
	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
	u16 local_port = mlxsw_sp_port->local_port;
	struct mlxsw_sp_sb_pm *pm = mlxsw_sp_sb_pm_get(mlxsw_sp, local_port,
						       pool_index);

	*p_cur = mlxsw_sp_cells_bytes(mlxsw_sp, pm->occ.cur);
	*p_max = mlxsw_sp_cells_bytes(mlxsw_sp, pm->occ.max);
	return 0;
}

int mlxsw_sp_sb_occ_tc_port_bind_get(struct mlxsw_core_port *mlxsw_core_port,
				     unsigned int sb_index, u16 tc_index,
				     enum devlink_sb_pool_type pool_type,
				     u32 *p_cur, u32 *p_max)
{
	struct mlxsw_sp_port *mlxsw_sp_port =
			mlxsw_core_port_driver_priv(mlxsw_core_port);
	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
	u16 local_port = mlxsw_sp_port->local_port;
	u8 pg_buff = tc_index;
	enum mlxsw_reg_sbxx_dir dir = (enum mlxsw_reg_sbxx_dir) pool_type;
	struct mlxsw_sp_sb_cm *cm = mlxsw_sp_sb_cm_get(mlxsw_sp, local_port,
						       pg_buff, dir);

	*p_cur = mlxsw_sp_cells_bytes(mlxsw_sp, cm->occ.cur);
	*p_max = mlxsw_sp_cells_bytes(mlxsw_sp, cm->occ.max);
	return 0;
}